CN103920367B - The constant temperature absorption process of carbon dioxide removal and equipment from biogas - Google Patents
The constant temperature absorption process of carbon dioxide removal and equipment from biogas Download PDFInfo
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- CN103920367B CN103920367B CN201410110202.1A CN201410110202A CN103920367B CN 103920367 B CN103920367 B CN 103920367B CN 201410110202 A CN201410110202 A CN 201410110202A CN 103920367 B CN103920367 B CN 103920367B
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- Prior art keywords
- carbon dioxide
- gas
- regenerator
- biogas
- solution
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 69
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 61
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 29
- 238000005276 aerator Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000010992 reflux Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 42
- 239000007789 gas Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000003345 natural gas Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 238000005261 decarburization Methods 0.000 claims description 6
- 239000008246 gaseous mixture Substances 0.000 claims description 6
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 abstract description 9
- 230000008929 regeneration Effects 0.000 abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 20
- 238000011084 recovery Methods 0.000 description 3
- 150000001412 amines Chemical class 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Abstract
The invention discloses the constant temperature absorption process of carbon dioxide removal from biogas, including step one, after raw material biogas supercharging in absorption tower carbon dioxide removal being absorbed by decarbonizing solution；Step 2, passes into regenerator by the decarbonizing solution after absorbing carbon dioxide in step one, contacts with air inversion, removes the carbon dioxide in decarbonizing solution so that it is regenerate and recycle；The heat of decarbonizing solution loss is supplemented by the electric heater in regenerator Solution dwell district.The equipment of realization includes absorption tower, regenerator, connects the top of regenerator bottom absorption tower, is provided with electric heater, and connects top, absorption tower by pump bottom regenerator；Regenerator top is also by controlling valve group, reflux pump connection decarbonizing solution storage tank；Also including aerator, connect gas-gas heat exchanger and flight electric heater, the latter connects the bottom, Solution dwell district bottom regenerator.The method realizes absorbing and regeneration of decarbonizing solution without steam constant temperature, reduces operating cost, allows being more widely applied of absorption process purifying biogas.
Description
Technical field
The present invention relates to a kind of method and apparatus of carbon dioxide removal from biogas, absorb and regeneration method and equipment particularly to a kind of decarbonizing solution constant temperature.
Background technology
Methane in sewage gas and carbon dioxide component are had a feature of significantly high Selective Separation because of it by absorption process, and prepare pipe natural gas or vehicle-mounted compressed natural gas field obtains and is widely applied very much at methane purification.
Conventional suction method is to utilize the By Amine Solutions physical chemistry absorption characteristic with carbon dioxide to realize separating of carbon dioxide in methane, i.e. pressurization in absorption tower, under normal temperature condition, By Amine Solutions and the carbon dioxide generation absorption reaction in biogas carry out decarburization and purify methane, the decarbonizing solution absorbing dioxy carbon becomes rich solution, rich solution decompression in regenerator, under heating condition, there is resolving inversely reaction, discharge highly purified carbon dioxide, rich solution is regenerated simultaneously, again possesses the ability of absorbing carbon dioxide, thus realizing the biogas continuous decarburization in absorption tower to purify methane process, and make decarbonizing liquid carry out continuous print absorption, recycling utilization.
During rich solution regeneration, it is necessary to consume a large amount of steam to boil rich solution and realize regeneration discharge carbon dioxide, meanwhile, high temperature after regeneration absorption liquid could be sent into absorption tower after needing again to be lowered the temperature and again participate in the separate absorbent process of carbon dioxide in methane.Traditional absorption process steam consumption is big, capacity usage ratio is low, heat transmission equipment investment is big, and especially for the enterprise not having steam boiler, the limitation of this method becomes apparent from.
Summary of the invention
It is an object of the invention to provide a kind of decarbonizing solution to absorb without steam constant temperature and regeneration, cost is low, and operating cost is low, the constant temperature absorption process of carbon dioxide removal from biogas that heat utilization efficiency is high and equipment.
For reaching above-mentioned purpose, present invention provide the technical scheme that the constant temperature absorption process of carbon dioxide removal from biogas, comprise the following steps: step one, raw material biogas is carried out pressurized treatment, and after supercharging, the Stress control of raw material biogas is at 0.6 ~ 1.0Mpa；Raw material biogas after above-mentioned supercharging is carried out carbon dioxide removal process in absorption tower, and the carbon dioxide wherein contained is absorbed by the decarbonizing solution of 80～85 DEG C, and the biogas after decarburization becomes bio-natural gas and discharges from top, absorption tower；Step 2: the decarbonizing solution after absorbing carbon dioxide described in step one is passed into regenerator, air inversion with 80～85 DEG C contacts, removing the carbon dioxide in decarbonizing solution, make decarbonizing solution regenerate and recycle, the gaseous mixture of air and carbon dioxide is discharged from regenerator top；Decarbonizing solution is in cyclic absorption carbon dioxide and regenerative process, and a small amount of heat lost because of heat radiation is supplemented by the electric heater of regenerator bottom solution stacking area.
Preferably, described step 2 air realizes first time heating by the gaseous mixture of the air discharged with regenerator top and carbon dioxide through heat exchange, realizes second time heating again through flight electric heater, and after heating, the temperature of air is 80～85 DEG C.
Preferably, the decarbonizing solution that in described step one, bio-natural gas is carried under one's arms reclaims after gas-liquid separation and recycles.
Preferably, the decarbonizing solution that described step 2 air and carbon dioxide mix gas are carried under one's arms reclaims after gas-liquid separation and recycles.
Realize the equipment of the constant temperature absorption process of carbon dioxide removal from biogas as above, including absorption tower, regenerator, bottom, described absorption tower connects the blower fan of conveying compressed biogas, connected the top spray device of described regenerator by Liquid level adjusting valve bottom absorption tower, it is provided with electric heater bottom regenerator, and is connected the top spray device on absorption tower by pump；Described regenerator top is connected to decarbonizing solution storage tank also by control valve group, reflux pump；Also including aerator, described aerator connects gas-gas heat exchanger and flight electric heater, and flight electric heater is connected to the bottom, Solution dwell district bottom regenerator by gas distributor.
Preferably, described reflux pump connects a PLC control system.
Preferably, top, described absorption tower is sequentially connected with the first gas-liquid cooler, the first gas-liquid separator, and described first gas-liquid separator is connected to decarbonizing solution storage tank by tapping valve.
Preferably, described regenerator top is sequentially connected with gas-gas heat exchanger, the second gas-liquid cooler, the second gas-liquid separator, and described gas-liquid separator is connected to decarbonizing solution storage tank by tapping valve.
Preferably, it is provided with accurate filter between described gas-gas heat exchanger and aerator.
Preferably, described flight electric heater and electric heater are provided with attemperating unit at outlet respectively.
A technical scheme in technique scheme has the advantage that or beneficial effect: the constant temperature absorption process of this biogas carbon dioxide removal, it is capable of absorbing and regeneration of decarbonizing solution without steam constant temperature, without setting up steam boiler, at utmost recovery system heat, equipment investment cost can be reduced, reduce operating cost simultaneously, make the application scenario of absorption process purifying biogas more extensive.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be done simple introduction below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Accompanying drawing 1 is the structural representation of the embodiment of the present invention.
Detailed description of the invention
Below by specific embodiment, the present invention is further illustrated.
The constant temperature absorption process of carbon dioxide removal from biogas of this embodiment comprises the following steps:
Step one, carries out pressurized treatment by raw material biogas, and after supercharging, the Stress control of raw material biogas is at 0.6 ~ 1.0Mpa；Raw material biogas after above-mentioned supercharging is carried out carbon dioxide removal process in absorption tower 4, the carbon dioxide wherein contained is absorbed by the decarbonizing solution of 80～85 DEG C, biogas after decarburization becomes bio-natural gas and discharges from top, absorption tower 4, and the decarbonizing solution that bio-natural gas is carried under one's arms reclaims after gas-liquid separation and recycles.
Step 2, decarbonizing solution after absorbing carbon dioxide in step one is passed into regenerator 8, air inversion with 80～85 DEG C contacts, remove the carbon dioxide in decarbonizing solution, make decarbonizing solution regenerate and recycle, decarbonizing solution is in cyclic absorption carbon dioxide and regenerative process, and a small amount of heat lost because of heat radiation is supplemented by the electric heater 7 of regenerator 8 bottom solution stacking area；The gaseous mixture of air and carbon dioxide is discharged from regenerator 8 top, and the decarbonizing solution that air and carbon dioxide mix gas are carried under one's arms reclaims after gas-liquid separation and recycles.The gaseous mixture that step 2 air is the air by discharging with regenerator 8 top and carbon dioxide realizes first time heating through heat exchange, realizes second time heating again through flight electric heater 9, and after heating, the temperature of air is 80～85 DEG C.
Realize the equipment of the constant temperature absorption process of carbon dioxide removal from biogas of this embodiment, including absorption tower 4, regenerator 8, bottom, absorption tower 4 connects the blower fan of conveying compressed biogas, connected the top spray device of regenerator 8 by Liquid level adjusting valve 5 bottom absorption tower 4, it is provided with electric heater 7 bottom regenerator 8, and is connected the top spray device on absorption tower 4 by pump 6；Regenerator 8 top is connected to decarbonizing solution storage tank 16 also by control valve group 18, reflux pump 17, and reflux pump 17 connects a PLC control system.Top, absorption tower 4 is sequentially connected with first gas-liquid cooler the 3, first gas-liquid separator 1, and the first gas-liquid separator 1 is connected to decarbonizing solution storage tank 16 by tapping valve 2；Regenerator 8 top is sequentially connected with gas-gas heat exchanger the 10, second gas-liquid cooler the 11, second gas-liquid separator 14, and the second gas-liquid separator 14 is connected to decarbonizing solution storage tank 16 by tapping valve 2.
Also including aerator 13, aerator 13 connects gas-gas heat exchanger 10 and flight electric heater 9, and flight electric heater 9 is connected to the bottom, Solution dwell district bottom regenerator 8 by gas distributor.Accurate filter 12 it is provided with between gas-gas heat exchanger 10 and aerator 13.Flight electric heater 9 and electric heater 7 are provided with attemperating unit 15 at outlet respectively.
Utilize this embodiment equipment elimination carbon dioxide in methane constant temperature absorption process particularly as follows:
Biogas after supercharging is passed into absorption tower 4, absorption pressure in absorption tower 4 is controlled at 0.6～1.0MPa, biogas with from the tower top on absorption tower 4 spray and under the decarbonizing solution of 80～85 DEG C contact at inner-tower filling material surface counter-current, carbon dioxide is transitioned into decarbonizing solution by absorption, purify artifact natural gas to discharge from top, absorption tower 4, enter subsequent handling then through being isolated the absorption liquid carried under one's arms after the first gas-liquid cooler 3 cooling by the first gas-liquid separator 1.
Absorb the decarbonizing solution of carbon dioxide to utilize pressure reduction to pass through Liquid level adjusting valve 5 to enter the top of regenerator 8, from tower top spray；Air is by aerator 13 pressure-increasing unit to accurate filter 12 simultaneously, remove fine dust particles, then pass through gas-gas heat exchanger 10, reclaim the heat of resolution gas carbon dioxide and heated for the first time, realizing second time heating to 80～85 DEG C again through flight electric heater 9, the heat that adds of flight electric heater 9 is adjusted by the attemperating unit 15 on gas outlet tube；Air after heating enters bottom, regenerator 8 Solution dwell district through gas distributor.Hot-air is fully contacted with decarbonizing solution from below to up with the form of little rill after being uniformly distributed, then overflow from top, Solution dwell district and rise, with top-down decarbonizing solution counter current contacting, the carbon dioxide in solution transitions into ascending air and discharges from regenerator 8 top together with thermal current after parsing.The resolution gas ejected once lower the temperature by gas-gas heat exchanger 10 and is realized after heat once reclaims, entering back into the second gas-liquid cooler 11 and being cooled to less than 30 DEG C, empty after isolating, subsequently into the second gas-liquid separator 14, the solution carried under one's arms.The solution parsing carbon dioxide falls into the Solution dwell district bottom regenerator 8, the solution after regeneration by pump 6 from extract out bottom regenerator 8 pump into absorption tower 4 top spray and, the decarburization again participating in biogas purifies absorption process.Being provided with electric heater 7 in regenerator 8 Solution dwell district, the heat that adds of electric heater 7 is adjusted by the attemperating unit 15 on regenerator 8 taphole pipe.
First gas-liquid separator 1 and the second gas-liquid separator 14 are equipped with liquid-level auto-control device, when in separator, the liquid level of decarbonizing solution is higher than the level value set, the tapping valve 2 of separator bottom can automatically open up, and the decarbonizing solution of recovery flows into decarbonizing solution storage tank 16.Along with the recovery of decarbonizing solution, when the liquid level of the decarbonizing solution in separator is lower than the level value set, tapping valve 2 is automatically switched off.When the liquid level in decarbonizing solution storage tank 16 is higher than setting value, reflux pump 17 is started automatically by PLC control system, and opens pump discharge control valve group 18 and decarbonizing solution fills into regenerator 8 top, thus realizing reuse, and ensures the solution equilibria of absorption system.
Absorption tower in this embodiment biogas separation equipment, regenerator, solution line, hot-air pipeline, pipe fitting all carry out isothermal holding, reduce the scattering losses of heat as far as possible, and the heat of scattering losses is supplemented by the electric heater 7 in regenerator 8 Solution dwell district, the temperature of the temperature and air that therefore circulate decarbonizing solution in whole system all controls at 80～85 DEG C, absorbs thus realizing isolating the decarbonizing solution of carbon dioxide from biogas without the constant temperature of steam regeneration.
Principles of the invention and embodiment are set forth by specific embodiment used herein, and the explanation of above example is only intended to help to understand method and the core concept thereof of the present invention.The above is only the preferred embodiment of the present invention, should be understood that, finiteness due to literal expression, and objectively there is unlimited concrete structure, for those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to make some improvement, retouching or change, it is also possible to above-mentioned technical characteristic is combined by rights；These improve retouching, change or combination, or the not improved design by invention and technical scheme directly apply to other occasion, are regarded as protection scope of the present invention.
Claims (9)
1. the constant temperature absorption process of carbon dioxide removal from biogas, it is characterised in that comprise the following steps:
Step one: raw material biogas is carried out pressurized treatment, after supercharging, the Stress control of raw material biogas is at 0.6 ~ 1.0Mpa；Raw material biogas after above-mentioned supercharging is carried out carbon dioxide removal process in absorption tower, and the carbon dioxide wherein contained is absorbed by the decarbonizing solution of 80～85 DEG C, and the biogas after decarburization becomes bio-natural gas and discharges from top, absorption tower；
Step 2: the decarbonizing solution after absorbing carbon dioxide described in step one is passed into regenerator, air inversion with 80～85 DEG C contacts, removing the carbon dioxide in decarbonizing solution, make decarbonizing solution regenerate and recycle, the gaseous mixture of air and carbon dioxide is discharged from regenerator top；Decarbonizing solution is in cyclic absorption carbon dioxide and regenerative process, and a small amount of heat lost because of heat radiation is supplemented by the electric heater of regenerator bottom solution stacking area.
2. the constant temperature absorption process of carbon dioxide removal from biogas according to claim 1, it is characterized in that: described step 2 air realizes first time heating by the gaseous mixture of the air discharged with regenerator top and carbon dioxide through heat exchange, realizing second time heating again through flight electric heater, after heating, the temperature of air is 80～85 DEG C.
3. the constant temperature absorption process of carbon dioxide removal from biogas according to claim 1, it is characterised in that: the decarbonizing solution that in described step one, bio-natural gas is carried under one's arms reclaims after gas-liquid separation and recycles.
4. the constant temperature absorption process of carbon dioxide removal from biogas according to claim 1, it is characterised in that: the decarbonizing solution that described step 2 air and carbon dioxide mix gas are carried under one's arms reclaims after gas-liquid separation and recycles.
5. realize the equipment of the constant temperature absorption process of carbon dioxide removal from biogas as described in any one of claim 1-4, it is characterised in that:
Including absorption tower, regenerator, bottom, described absorption tower connects the blower fan of conveying compressed biogas, connected the top spray device of described regenerator bottom absorption tower by Liquid level adjusting valve, be provided with electric heater bottom regenerator, and connected the top spray device on absorption tower by pump；Described regenerator top is connected to decarbonizing solution storage tank also by control valve group, reflux pump；
Also including aerator, described aerator connects gas-gas heat exchanger and flight electric heater, and flight electric heater is connected to the bottom, Solution dwell district bottom regenerator by gas distributor；
Described regenerator top is sequentially connected with gas-gas heat exchanger, the second gas-liquid cooler, the second gas-liquid separator, and described gas-liquid separator is connected to decarbonizing liquid storage tank by tapping valve.
6. the equipment of the constant temperature absorption process of carbon dioxide removal from biogas according to claim 5, it is characterised in that: described reflux pump connects a PLC control system.
7. the equipment of the constant temperature absorption process of carbon dioxide removal from biogas according to claim 5, it is characterized in that: top, described absorption tower is sequentially connected with the first gas-liquid cooler, the first gas-liquid separator, and described first gas-liquid separator is connected to decarbonizing solution storage tank by tapping valve.
8. the equipment of the constant temperature absorption process of carbon dioxide removal from biogas according to claim 5, it is characterised in that: it is provided with accurate filter between described gas-gas heat exchanger and aerator.
9. the equipment of the constant temperature absorption process of carbon dioxide removal from biogas according to claim 5, it is characterised in that: described flight electric heater and electric heater are provided with attemperating unit at outlet respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410110202.1A CN103920367B (en) | 2014-03-24 | 2014-03-24 | The constant temperature absorption process of carbon dioxide removal and equipment from biogas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410110202.1A CN103920367B (en) | 2014-03-24 | 2014-03-24 | The constant temperature absorption process of carbon dioxide removal and equipment from biogas |
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| Publication Number | Publication Date |
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| CN103920367A CN103920367A (en) | 2014-07-16 |
| CN103920367B true CN103920367B (en) | 2016-07-27 |
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| CN107399778A (en) * | 2017-08-30 | 2017-11-28 | 博能盛诺(北京)生物质能源科技有限公司 | For separating the equipment and system of the carbon dioxide in Methane decarbonization liquid |
| CN113531683A (en) * | 2020-04-22 | 2021-10-22 | 东南大学 | Internal heat type dehumidification solution regeneration device |
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| JPH0731834A (en) * | 1993-06-28 | 1995-02-03 | Mitsubishi Heavy Ind Ltd | Regeneration of absorbing solution |
| EP1391669A2 (en) * | 2002-08-21 | 2004-02-25 | Mitsubishi Heavy Industries, Ltd. | Plant and method for producing liquefied natural gas and recovering carbon dioxide contained in natural gas and in a combustion exhaust gas |
| CN201003050Y (en) * | 2007-02-06 | 2008-01-09 | 东莞市康达机电工程有限公司 | Processing apparatus for producing sulfur-free natural gas using methane |
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| CN203429147U (en) * | 2013-08-07 | 2014-02-12 | 湖南和道资源科技有限公司 | Methane purifying system |
| CN203469814U (en) * | 2013-08-07 | 2014-03-12 | 湖南和道资源科技有限公司 | Regeneration recycling system of decarbonization solution capable of absorbing carbon dioxide |
| CN203777901U (en) * | 2014-03-24 | 2014-08-20 | 湖南和道资源科技有限公司 | Constant-temperature absorption equipment removing carbon dioxide from biogas |
-
2014
- 2014-03-24 CN CN201410110202.1A patent/CN103920367B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731834A (en) * | 1993-06-28 | 1995-02-03 | Mitsubishi Heavy Ind Ltd | Regeneration of absorbing solution |
| EP1391669A2 (en) * | 2002-08-21 | 2004-02-25 | Mitsubishi Heavy Industries, Ltd. | Plant and method for producing liquefied natural gas and recovering carbon dioxide contained in natural gas and in a combustion exhaust gas |
| CN201003050Y (en) * | 2007-02-06 | 2008-01-09 | 东莞市康达机电工程有限公司 | Processing apparatus for producing sulfur-free natural gas using methane |
| CN101475859A (en) * | 2009-01-21 | 2009-07-08 | 东莞市康达机电工程有限公司 | Method and apparatus for preparing sulfur-free natural gas from methane |
| CN203429147U (en) * | 2013-08-07 | 2014-02-12 | 湖南和道资源科技有限公司 | Methane purifying system |
| CN203469814U (en) * | 2013-08-07 | 2014-03-12 | 湖南和道资源科技有限公司 | Regeneration recycling system of decarbonization solution capable of absorbing carbon dioxide |
| CN203777901U (en) * | 2014-03-24 | 2014-08-20 | 湖南和道资源科技有限公司 | Constant-temperature absorption equipment removing carbon dioxide from biogas |
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Effective date of registration: 20190121 Address after: 412007 Ninth Floor of Zhishan Science and Technology Building, 1986 Taishan Road, Tianyuan District, Zhuzhou City, Hunan Province Patentee after: Hunan He Dao resource Science and Technology Ltd. Address before: 412007 No. 26 Zhujiang South Road, Tianyuan District, Zhuzhou City, Hunan Province, 18 403 Rooms Patentee before: He Shaojun |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 Termination date: 20190324 |